Museum Phil 1974 Journal 45- Red Barn, National Seashore Headquarters, Mill Olema, Marin Co., California. 9 April waste smaller commoner species. Two of the clusters consisted of Myotis bat & these were probably at least 3-400 in the barn. The 2nd species is Myotis thysanodes, slightly larger. There were about 30 individuals in a group of 15 also. I also caught 2 solitary Myotis californicus small & w. very small feet. Tadarida brasiliensis have been caught here - & the place still smelled of them. 4 also Antrozous. Properly over deep in the rafters. It is obviously an old roost (the barn is at least 70 years old). Air temperature in the barn at the level of the bats was 10-11°C. The bats were torpid but after handling they began to arouse & up in 2 hrs all were flying. My strong impression that the M. thysanodes were deeper in torpor (at least slower to arouse) than the M. yumanensis. Centaurs the M. thysanodes also closer to the (only) light bulb. About 50% of the M. yumanensis were very early pregnant & 90-100% of the M. thysanodes were pregnant all but were q, with the exception of one or 2 M. californica. Most were fat on dissection.